API Ecofix Sludge Destroyer and Water Clarifier, Safe for Pets When Used as Directed, 473 ml Bottle

Works really well, may be not as effective as the Fluval product a bit cheaper on the day.

Excellent. I used this regularly together with barley Straw extract from Pond Doctor and my pond is crystal clear without any harm to all the wildlife.

Algae slowing down, after putting 1st lot in, will see later as time goes on.

Has made no difference to my pond whatsoever

I was away during the autumn last year and my pond suffered from a surfeit of leaves. I removed as many as possible without disturbing pond life (newts and frogs). There was still lots of dirt gathered in the pond. This is not a quick fix. I have been treating the pond for about 6 weeks and now it has begun to clear. I will continue for a little while longer just until the aerating plants have grown somewhat. If you are patient it does work.

Excellent. Noticeably improved clarity by reducing floating sediment in my 1500-litre pond within the first two weeks. It's so concentrated that there's a fair bit left over to continue dosing.

This stuff worked great! My father built a pond in his backyard that had some koi in it as well as plants and would maintain it by hand without any chemicals. My father was no longer able to take care of the pond and it started to build up bad with algae and sludge just hanging off the waterfall no matter how much I skimmed the pond. I was freaking out, it was my fathers pride and joy. I bought this and I used it along with algae fix. I started out VERY slow because of a few reviews I seen about it harming fish, but also because I had no clue how many gallons the pond was (I had to use my math skills to come up with an idea) I put it in at night thinking it would be better because it was cooler at night and applied it right into the waterfall.in the morning I went out to look and to my surprise it looked better, not a lot better but definitely not worse like it has been every morning. Next dispense I decided to add more than the last time, and I kept slowly adding more each time until I hit the recommended dosage for the amount of gallons I came up with. Within a week, maybe week and a half, the pond looked great. I could finally see the bottom. I made sure to buy a bunch for my step mom to use and set up a schedule to maintain it. This product saved my sanity.

Does exactly what it says. It took about a week cleared all the sledge up..

I use this in my Yellow Bellied Cooter's 40 gallon tank. As turtle fans know turtle tanks are very hard to keep clean. This item works great to keep his water clean and clear. It also extends the time between filter cleanings and my turtle is very healthy, my turtle is 13 years old and 6 inches long.

This worked great to clear up the sludge in our pond. Had tried more expensive brands from the nursery/pond store and this works far superior for less money as well. Win/win!